Nothing really interesting here just my old M480 hybrid put back together and changed up a little bit after I disassembled it when making the Mjöllnir cannon.

This cannon uses the same fuel metering setup as Mjöllnir. I really love using manometric fueling, makes things like this much easier plus i'm having more success with this cannon compared to when it used to have volumetric fueling.

Chamber is 1.25" with some 1" fittings. Union is 3/4". I use MAPP gas up to 10x mixes and use 4 orings to seal the modified union. I have 15mm and 20mm copper barrels and a 44mm aluminium barrel that will be used for golf balls and the likes. I should still see supersonic golf balls even though the barrel is only a meter long so the cannon still packs a punch.

Anyway I hope this shows the doubters how easy it can be to build a hybrid. $50 of plumbing fittings, couple of gauges and a MAPP bottle. I feel safer firing this than any of my PVC cannons funnily enough.

P.S. I don't care that it looks like sh|t, the beauty is on the inside

I think I will go with steel pipe, with sufficient wall thickness. In that way I can just thread the inside, and keep the whole thing serviceable.

The only problem is that nice steel pipes are mostly distributed by companies that are not interested in selling to individuals, especially not when they don't need more than 1 meter. I had the same problem with O-rings for my QDV.

Another thing is that I would like to take the gun to 20x mix eventually, if I make myself a nice pump.

I don't think it is difficult to build a hybrid... It just seems very complicated with fuel metering, and pressurisation.

It requires very basic math and that's about it. All I have to remember is that 0.71PSI of MAPP gas in the chamber per mix (n). A 5x shot has 3.55PSI of MAPP for example.

So: (0.71 x n) + (14.7 x (n-1))Takes about 10 seconds to figure out in my head and the rest is reading a gauge. I think it's easier than volumetric because the chamber volume is irrelevant and the fueling is simplified where you are only dealing in fuel pressures from 0-10PSI.

oh, and MrCrowley, Any chance of some damage pics? (or vids)

Perhaps this weekend. I made this cannon to take up to my friends bach (holiday house) in early June. If you've seen the video for my Mjollnir cannon, that was filmed up there.

The only problem is that nice steel pipes are mostly distributed by companies that are not interested in selling to individuals

I would do some more looking online, Try speedymetals or onlinemetals, I was able to get a 18" segments of aluminum with .25" wall thickness for only $20 and that was 3.75" diameter so with 30mm it should be pretty darn cheap.

irisher wrote:I would do some more looking online, Try speedymetals or onlinemetals, I was able to get a 18" segments of aluminum with .25" wall thickness for only $20 and that was 3.75" diameter so with 30mm it should be pretty darn cheap.

Thank you for your suggestion.I want strong steel tubes,however, because they can take about 4 times more pressure, and if I thread them, the threads are less likely to fail.Aluminium is also harder to weld for me, and the welds need to be perfect, because I want to fire this thing from my shoulder.